Process of making castings.



No. 839,560. PATENTED DEC. 25, 1906. J. C. DAVIS.

PROCESS OF MAKING GASTINGS.

APPLICATION FILED JULY 19.1904.

WITNESSES; INVENTOR,

TED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented Dec. 25, 1906.

' Application filed July 19, 1904. Serial No. 217,262.

To all whom it may concern/.-

Be it known that LJAMEs CAREY DAvIs, a citizen of the United States, resid' at Hinsdale, Dupage'county, in the State of Hinois, have invented a certain new and useful Process of Making Castings, of which the following is a specification.

My invention relates to the art of casting metals, and particularl 'to making castings in which a hardening e ement is intermixed with metal in order to modify its tempering properties, the invention being an improvementupon the process set forth in the patent to Davis No. 727,103 of May 5, 1903. The objectsof the resent invention are, to provide a metho 'of mixing a hardening element in a casting in predetermined quantity and position therein and to introduce this element more easily; to provide a casting which has distinct strata capable of be' hardened and other strata and'parts whi dl i are left soft; and to generally improve prov cesses of making castings with portions capaof the ble of being tempered. These objects, and other advantages which will hereinafter appear, I attain -'by means of the mode of manipulation as hereinafter set forth, and by use of the ap aratus illustrated in its essentials in wherein Figure 1 is a sectional .view of arotatable mold and side elevations of the other parts of the apparatus,'a.nd'

Figure 2 is a top lan view of the mold and eastinglindicating t e method of distribution "ardening element in the casting.

In the patent above'referred to the process is more articularly ada ted to distributing the hardening element t r ing, but in varying -r0 ortions, by means of centrifugal forces whicli act during the pouring of the metal. But thisis not necessary in providing a 1e definite. stratum of inetal which is capa le of being hardened in the furnace while the remainder of the casting is left soft. If it is "desired'to introduce the hardening element "at several distinct points in the casting and in varying proportions at different places this may be accomplished also, as hereinafter described. For my purposes I find it convenient to use the apparatus; shown in the drawings, from w ch it will be'seen that upon a suitable stand 3 Ihave mounted arotatable mold 4 which-is driven by any convenient form of gearing 5 and during'the rotation of the mold 8, and when these, pro erly t e accompanying drawings,-

oughout the castthe metal is poured into the gate 6 from feed spout 7, and a convenient form of ladle such as indicated at Sis used to introduce into the metal a finely divided hardening element sucn as manganese.

I have shown for illustration a circular casting 9 which may be desired to harden upon its outer periphery 10 as indicated by the density of shading in the drawings. In the procedure, while the mold is stationary, I introduce into the gate 7 a quantity of the molten metal and at the same time, or there after, the hardening element from the ladle roportioned, have entered the mold, I egin t e rotation of the mold by turning the gears 5, which will first cause the mixture of steel and hardening element to travel outward to the peri hcry 10 and distribute itself evenly along t at part, Thereafter, and while the rotation is still proceeding, I continue the pouring of the metal alone, and fill up the remainder of the casting with the soft metal so that when that I am able to determine with greatrecision and in a variety of ways the distri ution of the hardening element throughout the casting, the effect desired being secured by alternate or intermittent rotation and nonrotation of the mold. The casting now being taken out of the mold and machined,

and then placed in the furnace for heating it case I should desire the will be understood that the presence of the ma anese in the particular points indicate will render the casting capable of hardening at the outer periphery 10 while the central ortion of the casting 9 and the main part 0 the flange will remain soft and ten h. The various advantages of I this mei iod will be apparent to those familiar with the art. 4

Having thus described my invention and illustrated its use, what I claim as new, and desire to secure by Letters Patent, is the following-f 1. The process of making castings which consists in introducing a certain quantity of molten metal and a hardening element into a p mold, while the same is stationary, then m tating the mold to distribute the hardening element on the outer periphery of the casting and thereupon filling up the remainder of 'po alone, and thereafter heating and tempering. the casting so that it is hard Where the har the mold with the metal alone.

2. The process of making castings consisting in introducing molten metal and a hardening element in a mold, while it is stationary, then rotating the mold to distribute the hardening element, and then filling up the remainder of the moldwith the molten metal as the rotation continues, substantially as and for the purposes described.

'3. The casting process which consists in metal into a mold and with it a hardening element of eater specific gravity, then rotating the mo (1 to distribute the hardening element upon the outer periphery, then po in more of thevmetal so that the center of t e casting is soft, then 7 again introduc' a hardening element to. distribute it at a different part of the pephery, substantially as and for the purpose described. 1 1

4; The process of malfl'ng castings which consists introducing a hardening element ing and rotating the mold to distribute it upon the outer peripheries of such strata and uring the center of the casting with metal dening element is present and soft in the other portions. V

- 5. The process of making castings which consists in pouring into a mold while station ary a certain quantity of metal and adding thereto during the pouring operation a hardening element of greater specific gravity,

"then rotating the mold to distribute the said hardening element with the metal containing the same upon the outer periphery of the mold, and thencontinuing the rotation of.- the moldand at the same ,time' pouring therein the metal alone In testimony whereof I have hereunder si ed my name in the presence ofthe two su scribed'uritnessesj r Witnesses; t JANE CARBENTER,

ALBERT G. MILLER.

JAMES CAREY nAVis- 

